基于响应面法的强力甲板结构优化设计

Structural Optimization of Bulk Carrier Strength Deck by Response Surface Methodology

对于大型散货船,强力甲板是船体承受总纵弯矩及局部载荷的主要构件。特别是在压载工况下,强力甲板易出现结构问题,因此合理的强力甲板设计对船舶结构安全性和经济性十分重要。提出了基于响应面法的船体结构优化方法,并对一艘76 000 DWT散货船货舱段的强力甲板结构进行优化设计以验证该方法的有效性。在不同板厚尺寸、相同工况下进行甲板参数的灵敏度分析,选取适合的参数作为自变量。在计算出最大相当应力的基础上,应用响应面法的均匀设计试验方法,得出该舱段强力甲板最大应力与结构尺寸的函数表达式。以结构重量最轻为目标函数,在结构强度以及规范要求的最小厚度的约束条件下,对该舱段的强力甲板结构厚度进行优化。所得的优化结果说明该优化设计方法在实际工程中具有应用价值。

As for large bulk carriers,the strength deck is one of the main structures which not only bears the longitudinal bending moment,but also transfers the relatively high local load,especially in the ballast operating condition.Therefore,the rational design for strength deck is very important to the security and budget-saving of ship structures.In this article,the sensitivity analysis of strength deck under the cargo hold of a 76 000 DWT bulk carrier was carried out to select the proper parameters as independent vari ables.On the basis of calculating von Mises stress via finite element method,the functional expression of maximum stress and thickness of strength deck was established via the designed experiments of response surface methodology.By setting the minimum mass as objective function and subjecting strength and re quired minimum thickness to be constraint conditions,the strength deck was optimized.